today, if you're watching and want to get involved in any of this, tell me, many have been strong about all these things. people saying there's no link between any of this and anyone watching violent video games, but here's my question. in all your experience, if somebody is mentally ill, mentally unstable, vulnerable, if you like, and they are watching very violent video games a lot, can it stimulate them, does it desensitize them, can it be part of the provocation, if you like, for making them go and do an atrocity? >> i don't think it's part of the provocation. let me say something. we're talking about mental illness, doesn't mean you're mentally unstable. the majority of people in treatment with serious mental illnesses likes asperger's, schizophrenia, bipolar, are stable, living productive lives, are working. let's be really clear about that. what happens, i look at that research for many, many years.